MATLAB: Problem with non-existent variables

geoinfogpsinfoMATLAB

I try to write a code for extract gps info for my study. I used them in a xls file. I write the code below but have problem with non-existent values. Some of the photos are not have gps info, I want to give 0 values for these photos's info but I couldn't do that. Btw, I am novice programmer.
 list = dir('*.JPG');
[m n]= size(list);
sz = [m 3];
varTypes = { 'string','string','string'};
varNames = {'ImageName','Lat','Lng'};
T = table('Size',sz,'VariableTypes',varTypes,'VariableNames',varNames);
for i = i:m
       disp(list(i).name);
       imgName = list(i).name;
       info = imfinfo(imgName);
       if isfield(info.GPSInfo)
       lat = info.GPSInfo.GPSLatitude;
       lng = info.GPSInfo.GPSLongitude;
       strLat = lat(1) + "," + lat(1)+ "," + lat(3);
       strLng = lng(1) + "," + lng(1)+ "," + lng(3);
       T(i,:) = {imgName, strLat,strLng};
       else 
       lat = [0 0 0];
       lng = [0 0 0];
       strLat = lat(1) + "," + lat(1)+ "," + lat(3);
       strLng = lng(1) + "," + lng(1)+ "," + lng(3);
       T(i,:) = {imgName, strLat,strLng};
end
end

Best Answer

Your concept is fine, but you need to read the isfield help and use it correctly: its second input argument must be the name of the field:
if isfield(info,'GPSInfo')
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